Photographic shutter



n Patented 1an. 3l, |899.

PHOTO HHHHHHHHHHHHH R.

( ooooooo UNITED STATES l'OHN A. MOSIIER, OF CHICAGO, ILLINOS, ASSIGNORTO THE VESTLAKF. COMPANY, OF ILLINOIS.

PATENT OEEICE.

ADAMS &

PH'oToeRAPHlc SHUTTER.

SPECIFICATION forming part of Letters Patent No. 618,799, dated January31, 1899.

Application iiled October 14, 1898. Serial No. 693,546, (No model.)

To @ZZ whom t may concern.-

Beit known that I, JOHN A. MOSHEE, a citizen of the United States, andaresident of Chicago,county of Coolgand State of Illinois,have inventedcertain new and useful Improvements in Camera-Shutters, of which thefollowing is a speciiication, and which are illustrated in theaccompanying drawings, forming a part thereof.

The invention relates to that class of shutters in which an oscillatingapertured plate plays across the lens-aperture of a photographic cameraand is so mounted and operated that it effects an exposure at eachmovement across the lens-aperture and without preliminary setting.

The objects of the invention are to simplify the construction and actionof shutters of this class and to secure prompt and reliable action.These objects are attained by the construction hereinafter described,and which is fully illustrated in the accompanying drawings, in which@Figure 1 is an elevation of the inner face of the front plate of acamera, the shutter and its actuating mechanism being mounted thereon.Fig. 2 is a sectional view on the line 2 2 of Fig. 1. Figs. 8, 4, and 5are detail sections on the lines 8 3, 44, and 5 5, respectively, of Fig.1.

The front plate of a camera is shown at A, and an ordinaryshutter-plate, substantially segmental in form, is shown at B and isprovided with an exposing aperture b and is mounted, by means of apivot-pin o', so that it oscillates between the fixed stops C C. Thelens-aperture in the plate A is represented at a, and the shutter-plateis so mounted that its aperture h crosses this lens-aperture as theshutter oscillates.

A stud or pin D projects from the face of the plate B and is preferably,though not necessarily, located in the heel of the plate-that is to say,upon the opposite side of its pivotpin with reference to the aperture b.A V- cam E, carried by and preferably formed integrally with areciprocating plate F, cooperates with the stud D, and the plate F iscontrolled by means of a push-button G', located upon the outer face ofthe plate A and having a shank or stem which extends through a suitableslot in this plate, allowing the button a to-and-fro movement. Thebutton Cr is preferably connected with the plate F by means of arock-lever G, pivoted to the inner face of the plate A at g and to thearm F at g'. In order to prevent frictional contact of the plate F withthe shutter-plate B, the former is mounted upon the outer face of thelever G and at its farther end is provided with an inturned lug f,adapted to slide upon the face of the plate A.

A spring H is ixedly attached to the plate F and is in approximatelylongitudinal relation therewith and, projecting beyond this plate,slides in a loop 7?., fixed to the plate A. As shown, the spring H is astraight wire. It may take anyother desired form, providing it is somounted that by extension it causes the V-cam E to bear against the studD.

A stop-arm K is pivoted at m to the inner face of the plate A and isadapted to reciprocate between the fixed stops O O and is controlled bymeans of a push-button M, the stem of which passes through a suitableslot in the ,plate A and is fixed in the arm K. A suitable catch, suchas the lug 7c, is attached to the plate B, and the parts are so disposedthat the arm K may be thrown into the path of this catch, so as to stopthe shutter when its aperture IJ is in register with the aperture a. v

The operation of the shutter is as follows: Assuming the parts to be inthe position shown in Fig. 1, movement of the plate F to the right willcause its depression by reason of the sliding of the right face of thecam E upon the stud D until the apex of the cam is reached, and thispressure will hold the plate B in the position lin which it is shown. Assoon as the apex of the cam E passes the stud D and the left face of thecam bears upon this stud the pressure of the spring H tends to and doesthrow the shutter to the right, and the parts are at once in readinessfor a reverse movement. Upon reversing the movement of the plate F theoperation of the shut- -ter is repeated in the reversed direction.Should the arm K be thrown into the path of the lug k, the shutter willbe stopped with its aperture b in register with the aperture afor atime-exposure, and the shutter is closed by a reverse movement of theplate F.

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It is understood, of course, that the movement of the plate F isaccomplished by a toand-frc movement of the button G.

I cla-iin as my invention- 1. In a camera-shutter, an oscillating plate,and areciprocating bar, in combination with a V-cam carried by one ofsuch members, a bearing part carried by the other of such members andcooperating with the cam, and a spring' for maintaining the cam andbearing part in contact.

2. In a camera-shutter, the combination with an oscillating`shutter-plate and a stud projecting from its surface, of a reciprocatingbar, a V-cam carried by such bar and engaging the stud, and a springforforcing the cam against the stud.

In a camera-Shutter, an oscillating plate, and a reciprocating bar, incombination with a V-cam carried by one of such members, a bearing partcarried by the other of such members and cooperatingl With the cam, aspring for maintaining the cam and bearing part in Contact, and anoscillating lever for reciproeating1 the bar.

4. In a camera-shutter, an oscillating plate, and a reciprocating bar,in combination with a V-cam Carried by one of such members, a bearingpart carried by the other of such mem* bers and coperating With the cam,a spring I" or maintaining' the Cam and bearing part in contact, and amovable detent adapted to i11- terceptthe shutter-plate intermediate ofthe normal limits of its movement.

JOHN A. MOSIIER.

W'itn esses:

PAUL SYNNESTVEDT, HESTER B. DMRB.

